When i am creating new filter in Thunderbird 78.2.1 it is very convenient and easy to understand (well done). My filter is like this: If match all of the following conditions: 1. contains phrase "word 1" in subject 2. does not contains phrase "ERROR" in body then delete mail but now i want to add one more phrase into the condition 1. which is "word 2" and i do not know how / can not (i tried "word 1 OR word 2" ; "word 1;word 2" ) there are options: "match all of the following" "match any of the following" "match all messages" if i create third rule for that second phrase "word 2" and select "match any of the following", then i think it can delete mail even if it does not contain ERROR. But i need to keep mail if it contains error + any of the two phrases. Btw. what is the option "match all messages" it seems very vague and Thunderbird fails to provide any hint in Filter Rules window.